An introduction to mathematics, by A. N. Whitehead.

70 INTRODUCTION TO MATHEMATICS
the "constant" variables, or parameters.
The two systems meet naturally about the
middle of the alphabet. Sometimes a word
or two of explanation is necessary; but as a
matter of fact custom and common sense are
usually sufficient, and surprisingly little confusion is caused by a procedure which seems
so lax.
The result of this continual elimination of
definite numbers by successive layers of parameters is that the amount of arithmetic performed by mathematicians is extremely small.
Many mathematicians dislike all numerical
computation and are not particularly expert
at it. The territory of arithmetic ends where
the two ideas of "variables" and of "algebraic form" commence their sway.